S
M
T
W
T
F
S
26
60°
43°
27
73°
41°
28
70°
50°
29
64°
47°
30
51°
42°
1
55°
34°
2
47°
34°
3
58°
34°
4
72°
48°
5
75°
59°
6
60°
46°
7
60°
41°
8
61°
41°
9
66°
48°
10
64°
47°
11
63°
42°
12
69°
41°
13
67°
47°
14
51°
43°
15
66°
42°
16
71°
46°
17
83°
58°
18
88°
64°
19
84°
69°
20
74°
51°
21
63°
49°
22
64°
52°
23
65°
49°
24
76°
53°
25
77°
63°
26
80°
59°
27
76°
64°
28
76°
45°
29
79°
48°
30
72°
45°
31
73°
49°
1
73°
48°
2
74°
51°
3
76°
54°
4
78°
60°
5
77°
61°
6
77°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mount Vernon
Mount Vernon's May 2026 forecast shows daily high temperatures ranging from 72° to 79°, with overnight lows between 45° and 61°. The average high for May is 76° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Mount Vernon. See also: June | July | August.
